Very few people (among the world population) know what GNU/Linux is. Fewer care enough to switch to it. Even fewer know enough (or have the willpower, time and mental capacity to learn) to actually be proficient.
But among those who do, there are plenty of people who have learned Nix well enough it's no longer a weird arcane thingy that spews out incomprehensible errors for them. Although, I guess, among those no one will deny Nix can be better (but there are no multi-billion-dollar corporations spending tons of their resources on it).
It's like vim. First time you run it you probably can't even exit it - so, of course you think it's a disaster ;)
Such an exaggregation. Many thousands of people use it by choice, despite all alternatives. Hardly a disaster, by any definition.